It might not be the most glamorous gift, but the gift of a charged smartphone is one many sailors will appreciate. Instead of messing with inverters or 12-volt chargers, a large external battery charger is a simple way to keep the crew happy. This battery has a high 2.4-amp output for fast charging up to 10 times with two USB ports to charge multiple devices. RazorMega external battery, $70, www.mycharge.com

Anyone who uses their iPhone to navigate or in the sun knows that glare is a killer. This little stocking stuffer cuts the glare (or prying eyes). myFlipShade, $10, www.mycharge.com